When acting on your own, three synchronous sources emit similar sound waves of frequency 4.00 Hz at intensity level β = 7.50 dB. The three sources are placed all along the Y-axis at positions y = 0, Y = 0.50 m and Y = 0.75 m correspondingly. Find out the intensity level of the combined signal received all along the X-axis, at a distance of 2.00 m from the origin, if the three sources act concurrently. (Suppose for the velocity of sound the value V = 335 m/s)